Large sound speed in dense matter and the deformability of neutron stars

被引：51

作者：

Reed, Brendan ^{[1
,2
,3
]}

Horowitz, C. J. ^{[2
,3
]}

机构：

[1] Indiana Univ, Dept Astron, Bloomington, IN 47405 USA

[2] Indiana Univ, Ctr Explorat Energy & Matter, Bloomington, IN 47405 USA

[3] Indiana Univ, Dept Phys, Bloomington, IN 47405 USA

来源：

PHYSICAL REVIEW C | 2020年 / 101卷 / 04期

基金：

美国国家科学基金会;

关键词：

EQUATION-OF-STATE; NUCLEAR; RADIUS; MASS;

D O I：

10.1103/PhysRevC.101.045803

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The historic first detection of the binary neutron star merger GW170817 by the LIGO-Virgo collaboration has set a limit on the gravitational deformability of neutron stars. In contrast, radio observations of PSR J0740 + 6620 find a very massive neutron star. Tension between the small deformability and the large maximum mass may suggest that the pressure rises rapidly with density and thus the speed of sound in dense matter is likely a large fraction of the speed of light. We use these observations and simple constant sound-speed model equations of state to set a lower bound on the maximum speed of sound in neutron stars. If the tidal deformability of a 1.4M(circle dot) neutron star is less than 600, as is suggested by subsequent analyses of GW170817, then we find that the sound speed in the cores of neutron stars is likely larger than the conformal limit of c/root 3. Implications of this for our understanding of both hadronic and quark-gluon descriptions of dense matter are discussed.

引用

页数：6

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